Question

Why atomic size increases in a group but decreases in a period ?



I want a brief explanation....

Answer 1

HOLA MATE HERE IS UR ANSWER ♥♥♥♥

Electron shielding prevents these outer electrons from being attracted to the nucleus; thus, they are loosely held, and the resulting atomic radius is large. Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across aperiod.

This results in a DECREASE in atomic radii across the Period, due to the increased nuclear charge which draws in the valence electrons. On the other hand, going down a Group, we go to another so-called shell of electrons, that build on the preceding shell. Atomic radii thus INCREASE down the Group.

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Answer 2

$\huge\pink{Hello there }$

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Atomic size increase in a group because a new shell is added down the group which increases size of atom .

While

In period atomic size decrease because charge in nucleus increase which attracts the valence electrons more effectively

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